I like the stock solo. A gel insert covered with memory foam would be cool but not needed. It isn't just the seat, the bar position, how wide or narrow, the angle of the grips, the position of the foot pegs and ability to change positions if your definition is the same as mine for long distance. To me that would be NE PA to Orlando Fl in a days ride. My pegs are close enough I can put the back of my ankles on kind of like putting my feel up on an automan. You really need to couple all that with the seat that is best for you for disance rides.
